Thanks in advance for any replies on helping me diagnose this strange one.
I’ve got a Taxi (system 11B) with rows 2(Q81), 3(Q82), 5(Q84), and 6(Q85) out. I’ve replaced all TIP42’s with TIP42C’s, I’ve Replaced both 7406 at U55, and U56. The reason I replaced both IC’s, 1. They’re cheap. 2. When I ground out the TIP42 rows that aren’t working they light.
I’m stumped. Any suggestions?